如何在 Gremlin 上更新多个顶点属性？

发布于 2024-12-08 06:41:11 字数 181 浏览 0 评论 0原文

我想在顶点上添加多个属性。我可以这样做：

g.v(1).firstname='Marko'
g.v(1).lastname='Rodriguez'

但是如何在单个查询中使用以下哈希 {firstname:'Marko', lastname:'Rodriguez'} 添加这些属性？

原文

I want to add several properties on a vertex. I could do:

g.v(1).firstname='Marko'
g.v(1).lastname='Rodriguez'

But how to add these properties with the following hash {firstname:'Marko', lastname:'Rodriguez'} in a single query?

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为人所爱 2024-12-15 06:41:11

您可以构造一个可以工作的 SideEffect 管道。在简单的情况下，执行以下操作：

g.v(1)._().sideEffect{it.firstname='Marko'; it.lastname='Rodriguez'}

或者，如果您只需要在一个节点上工作并拥有映射，则可以使用映射的 each 方法：

m = [firstname:'Marko', lastname:'Rodriguez']
m.each{g.v(1).setProperty(it.key, it.value)}

或者您可以在管道内部执行此操作，其中你有一个包含你想要设置的值的哈希值。我们将再次使用 sideEffect 管道。因为闭包内有一个闭包，所以我们需要将第一个闭包中的 it 值别名为其他值，在本例中是 tn，“this node”的缩写，因此可以在第二个闭包中访问它。：

g = new TinkerGraph()
g.addVertex()
g.addVertex()
m = ['0': [firstname: 'Marko', lastname: 'Rodriguez'], '1': [firstname: 'William', lastname: 'Clinton']]
g.V.sideEffect{tn = it; m[tn.id].each{tn.setProperty(it.key, it.value)}}

这将产生以下结果：

gremlin> g.v(0).map
==>lastname=Rodriguez
==>firstname=Marko
gremlin> g.v(1).map
==>lastname=Clinton
==>firstname=William

此方法的一个潜在问题是您需要记住顶点 id 是字符串，而不是整数，因此请确保正确引用它们。

You can construct a SideEffect pipe that would work. In the simple case, do this:

g.v(1)._().sideEffect{it.firstname='Marko'; it.lastname='Rodriguez'}

Alternatively, if you need to work on just one node and have the map you can use the each method of a map:

m = [firstname:'Marko', lastname:'Rodriguez']
m.each{g.v(1).setProperty(it.key, it.value)}

Or you could do this inside of a pipe where you have a hash with values you wish to set. Once again, we'll use the sideEffect pipe. Because there is a closure inside of a closure we need to alias the value of it from the first closure to something else, in this case tn, short for "this node", so it is accessible in the second closure.:

g = new TinkerGraph()
g.addVertex()
g.addVertex()
m = ['0': [firstname: 'Marko', lastname: 'Rodriguez'], '1': [firstname: 'William', lastname: 'Clinton']]
g.V.sideEffect{tn = it; m[tn.id].each{tn.setProperty(it.key, it.value)}}

This will yield the following:

gremlin> g.v(0).map
==>lastname=Rodriguez
==>firstname=Marko
gremlin> g.v(1).map
==>lastname=Clinton
==>firstname=William

One potential gotcha with this method is that you need to remember that vertex id's are strings, not integers, so make sure to quote them appropriately.

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